Well, I am booked for 9 nights, 7 with one company and 2 directly through the oasis. I was going to use alpharooms.com for the extra 2 nights, but when I went there today, Oasis was sold out on their site AND bookit.com site! So, had to use orbitz.com to get the extra 2 nights for us. But, from all accounts they are only a limited amount of rooms left at the entire resort. Which is a good thing, that means there are a LOTTTTTT of people booked there!! Wooooooooohoooooooooooo get ready people its 25 days away!
Rooms you find on online booking sites are usually prebooked by the sites (that's how they get the good rates). So just because one site is not showing availibility, it doesn't mean the hotel itself is full.